Coal screen and washer



Julie-14,1927. 1,632,739

W. F. MARTIN COAL SCREEN AND WASHER Filed Aug. 16. 1926 TEE-a. .1 Z

um/Wm 0 1122722 7 jL/afln I Q W K N v mw k I m Mormon qvitmeoa PatentedJune 14, 1927. V

UNITED STATES 1,632,139 "PATENTTIOFFIHCE.

WILLIAM F. MARTIN, onHAnRIsBunG, PENNSYLVANIA.

' COAL SCREEN AND WASHER.

* Application filed August 1 6, 1926. Serial No. 129,532.

" I In the recovery of fine coal from river beds, it is customary tomount a pumpv and a screen upon a barge, the latter being. al-

lowed to drift down the stream while the pump sucks the accumulation ofmud and coal from thebed of the riverand discharges it onto the screen,with a stream of water. All foreign matter which is of little or novalue is then returned to the'river and the screened material dischargesontoasecond barge. It often happens, when recovering coal in thismanner, that the operators will encounter-streaks of clay-covered coalfrom which the clay cannot be washed or otherwise removed, without agreat deal of difliculty. Such streaks or runs materially decrease thevalue ofthe'recovered coal if discharged with that which is of goodquality, and it is the object of my inven-.

tion to' provide a new and improved screen structure 111 which novelprovlsion is made for permitting the streaks of clay-covered coal todischarge, back into the river, whenever they areencountered.

.Withthe foregoing in v ew, the invention resides in the novel subjectmatter hereinscreen frame in which a main screenti is mounted, saidframe having upstanding side mei'nbers 7 which rise to 'a'desired extentabove said screen. Above the screen 6 and between the side members 7 isa coarse screen .8 upon which the pump discharges, and below said screen6 are a. number of dump pockets 9 which may be opened and closed by anydesired means, said means preferably havinga hand lever 10.

The general construction so far briefly described, is shownxin my U. S.Patent No. 1,542,627,.but I have in the present applis cation, disclosedcertain improvements over this patented construction. It will be observed that the main screen 6 terminates short of the lower end of themain frame 5. The space thus formed between said main screen andsaidlower end of the frame/5, is occupied by an auxiliary screen frame11 which carries an auxiliary. screen 12, this screen being normallyflushwith the screen 6.. The frame 11 has its lowerend hinged at 13 tothe lower end of the frame 5, and provision is made, for raising saidframe 11 and its screen'12, whenever clay-'coatedcoal is discharged fromthe pump. Thus, with the screen12 and frame 11 raised as seen in Fig. 1,this clay-coated coal-may discharge into anoutlet'spout 14;, with whichthe fra me 5isprovided, under said parts, As soon as the pump inlet haspassed the streak of clay-coated coal, the screen 12 and frame 11 areagain lowered tothe position of Fig. 2 and the screening operation thenproceeds as before; I y I The details described below may well be usedfor raising and lowering the frame 11 and the screen 12 and it will beobserved that this may be quickly accomplished.

upperend of the frame 11 and is provided with upstanding ends 16. Links17 are pivotcd to these upturned bar ends, and the upper ends of saidlinks are pivoted to a pair of arms 18. These arms are secured to andproject from a roclcshaft 19 which is placed above the screen 12', saidrock shaft being mounted inbearing openings in the upper ends of apairof standards 20. These standards, in the present showing, are secured at21 to the side members 7 and they project a suitable distance above saidside members. One end of'the shaft 19 is provided with a hand lever 22,rigidly attached thereto, so that by moving this lever, the screen 12and frame 11 may be quickly and easily raised or lowered, ascircumstances may dictate.

To hold the shaft-19 in any position at which it may be set, I providesuitable means such as a dog 23 and rack 24.

A transverse metal bar 15 is secured to the Attentionis invited to thefact that the bar 15 is secured upon the upper end of the auxiliaryscreen 12. Hence, this bar protects the upper end of this screen againsttearing loose, as well as providing effective means to which to connectthelinks 17.

As excellentresults may be obtained from the general structure shown anddescribed,

it is preferably followed. However. within the scope of the invention asclaimed, variations may of course he made.

I claim 'l. A screen coniprising'a main inclinedframe, a main screensecured in said frame and terminating short of its lower end, anauxiliary screen extending from said main screen to the lower end ofsaid main frame, an auxiliary frame upon which said auxiliary screensecured, said auxiliary frame being hinged at its lower end to the lowerend of said mainfranie, a metal har extending transversely across theupper end of said auxiliary frame, resting upon the upper end of saidauxiliary screen and secured to said upper end of said auxiliary framesaid har having upturned ends, and means connected to said upturned endsfor swinging the auxiliary frame and screen upwardly when desired saidbar serving'toproteet the upper end of the auxiliary screen againsttearing loose and also affording means to which to connectsaid means forswinging the auxiliary frame and screen.

2. A screen comprising a niainfraine emhodyinc inclined longitudinalside liars. a lower transverse end liar and an additional transverse harupwardly spaced from said end bar, a main screen secured to said mainframe and having its lower end secured to said additional liar, anauxiliary rectangula "framebetween the aforesaid longitudinal bars andfilling the gap hetween said end barand saidwulditioinil transverselull, an auxiliary screen secured upon the upper side of said auxiliaryfran'ie, mean: hingedly connecting the lower end ha r o f said auxiliaryframe with said lower end hat of the main 'frame, and means connected tothe upper end bar of said auxiliary frame for string ing the latter andthe auxiliary screen upwardly, said upper end bar of said auxiliaryframe having its lower portion hevcled to prevent interference withdischarge of material fIOltl'tllCDltllll screen when said auxiliaryfran'ie and auxiliary screen are upwardly swun 1.

In testimony whereof I have hereunto al' fixed my signature.

lVILLL'rH F. MARTIN.

